I have an issue with my gas 2017 F250. The truck starts great cold. However if I drive and turn it off and get back in after 10-15 minutes it sometimes gives me a slow crank and than turns on. I have had after filling my tank up it won’t start at all and than after multiple try’s it barely does.

My mechanic couldn’t replicate the issue or diagnose the problem. Does anyone have any thoughts?

 

From your description it sounds like your vehicle has two separate problems..

If we understand you correctly,
There is a hot start problem and a possible over fuel problem.

Low power available to starter could explain some of it , but if n0t possibly over fueled, slow cranking speed could be sign of low power available to electronics resulting in
faulty signals to components.
A good part of the time this may be caused by poor connections preventing full power from getting to where it is needed.